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Issue 44, 2012
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Observation of two types of magnetization relaxation in a weakly correlated antiferromagnetic chain of MnIII2 single-molecule magnets

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Abstract

A MnIII2FeII chain with a [–MnIII–(OPh)2–MnIII–ON–FeII–NO–] repeat unit was synthesized via the assembling reaction of MnIII salen-type dimers and FeII pyridyloximate complexes, where the –(OPh)– and –ON– bridges represent a biphenolate bridge and an oximate bridge, respectively. The bulky counter anions, BPh4, which surround the chain to form a zeolite-like brick wall, successfully isolate the chains from a magnetic point of view. This compound is isostructural with Mn2Ni–BPh4, which is an SCM with ST = 3 (H. Miyasaka, A. Saitoh, M. Yamashita and R. Clérac, Dalton Trans., 2008, 2422). Because the FeII unit is diamagnetic, the MnIII dimer, which has the potential to be a single-molecule magnet (SMM), is nearly magnetically isolated, although a weak antiferromagnetic interaction with J/kB ≈ −0.1 K is perturbed between the MnIII dimers with ST = 4 via the FeII unit. Ac susceptibility data shows that two types of relaxation of the magnetization are present, which are attributed to SMM and chain relaxations.

Graphical abstract: Observation of two types of magnetization relaxation in a weakly correlated antiferromagnetic chain of MnIII2 single-molecule magnets

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Publication details

The article was received on 03 Jul 2012, accepted on 28 Jul 2012 and first published on 30 Jul 2012


Article type: Paper
DOI: 10.1039/C2DT31444D
Citation: Dalton Trans., 2012,41, 13691-13696
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    Observation of two types of magnetization relaxation in a weakly correlated antiferromagnetic chain of MnIII2 single-molecule magnets

    H. Miyasaka, A. Saitoh and M. Nakano, Dalton Trans., 2012, 41, 13691
    DOI: 10.1039/C2DT31444D

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